Shaving head for a dry-shaving apparatus

Abstract

In a shaving head (4) for a dry-shaving apparatus comprising a shaving-head frame (5) for detachably mounting an arcuate shear foil (6) which at both ends of at least one of its two longitudinal edges (7, 8) comprises projections (11, 12, 13, 14) associated with slots (22, 23) in the adjacent side walls (20, 21) of the shaving-head frame, into which slots the projections can be inserted when the shear foil is mounted on the shaving-head frame, the shear foil being secured to the shaving-head frame by means of at least one raised portion (26, 27, 28) which comprises at least one ramp (29) which is upwardly inclined in the direction of insertion, which projects from the shaving-head frame, and which engages beneath the relevant longitudinal edge of the shear foil, at least one such raised portion on the longitudinal member of the shaving-head frame adjacent the relevant longitudinal edge of the shear foil is arranged at a distance from the slots in the side walls of the shaving-head frame which constitute the lateral guide means for the projections on the shear foil, said raised portion comprising a further ramp (30) which is downwardly inclined in the direction of insertion and which substantially adjoins the ramp (29) which is upwardly inclined in the direction of insertion.

What is claimed is: 
     
       1. A shaving head for a dry-shaving apparatus which comprises: a shaving-head frame which comprises two longitudinal members, two side walls and slots with open ends formed in the side walls;   an arcuate shear foil detachably secured to said shaving-head frame, said foil having longitudinal edges and comprising at both ends of at least one of its longitudinal edges projections which are insertable into the open ends of the shaving-head frame slots during mounting of the shear foil on the shaving-head frame; and   at least one raised portion for securing the shear foil to the shaving-head frame and which is carried by one of said longitudinal members of the shaving-head frame adjacent a longitudinal edge of the shear foil and at a distance from said slots, wherein:   said raised portion comprises a first ramp which is upwardly inclined in the direction of insertion, which ramp projects from the shaving-head frame and engages beneath a longitudinal edge of the shear foil; and wherein said raised portion also comprises a second ramp which is downwardly inclined in the direction of insertion and which substantially adjoins said first ramp.   
     
     
       2. A shaving head as claimed in claim 1, wherein the slots have an extension which extends in the direction of the raised portion, beginning substantially at the level of the end of said second ramp. 
     
     
       3. A shaving head as claimed in claim 2, wherein the extensions of the slots extend up to the open ends of the slots. 
     
     
       4. A shaving head as claimed in claim 1, wherein the raised portion is ridge-shaped viewed in the direction of insertion. 
     
     
       5. A shaving head as claimed in claim 1, wherein the longitudinal member of the shaving-head frame is provided with two raised portions are provided whose mutual distance, viewed in the longitudinal direction of the longitudinal member, is at least equal to the distance between each raised portion and the adjacent side wall of the shaving-head frame. 
     
     
       6. A shaving head as claimed in claim 5, wherein, viewed in the longitudinal direction of the longitudinal member, the distance between the two raised portions is selected to be substantially twice the distance between each raised portion and the adjacent side wall of the shaving-head frame. 
     
     
       7. A shaving-head as claimed in claim 1 wherein said slots form lateral guides for the projections of the shear foil. 
     
     
       8. A shaving-head as claimed in claim 1 wherein said longitudinal members of said shaving-head frame carry two raised portions. 
     
     
       9. A shaving-head for a dry-shaving apparatus which comprises: a shaving-head frame (5) for detachably mounting an arcuate shear foil (6) therein, said shaving-head frame comprising longitudinal members (18, 19) and sidewalls (20, 21); said shear foil having at both ends of at least one of its two longitudinal edges (7, 8) projections (11, 12, 13, 14) which are associated with slots (22, 23) in the adjacent sidewalls (20, 21) of the shaving head frame, which slots form lateral guides for the projections (11, 12, 13 and 14) and into which slots the projections are inserted when the shear foil is mounted on the shaving-head frame;   said shear foil being secured to the shaving-head frame by at least one raised portion (26, 27, 28) on one of the longitudinal members (18, 19), which raised portion comprises at least a first ramp (29) projecting from the shaving-head frame and which is upwardly inclined in the direction of insertion and engages beneath a longitudinal edge of the shear foil; wherein   (a) said at least one raised portion (26, 27, 28) of a longitudinal member (18, 19) of the shaving head frame adjacent the longitudinal edge (7, 8) of the shear foil is arranged at a distance from the slots in the side walls (20, 21); and   (b) said raised portion further comprises a second ramp (30) which is downwardly inclined in the direction of insertion and which substantially adjoins the first ramp (29).